[Haskell-cafe] Version constraints and cabal.config files

[Anthony Cowley]

> On Mar 25, 2015, at 10:51 AM, Michael Snoyman <michael at snoyman.com> wrote:
> 
> 
> 
>> On Wed, Mar 25, 2015 at 4:30 PM Anthony Cowley <acowley at seas.upenn.edu> wrote:
>> On Wed, Mar 25, 2015 at 10:24 AM, Michael Snoyman <michael at snoyman.com> wrote:
>> >
>> >
>> > On Wed, Mar 25, 2015 at 4:17 PM Anthony Cowley <acowley at seas.upenn.edu>
>> > wrote:
>> >>
>> >> The suggestion to use "cabal install --dependencies-only ..." instead
>> >> of "cabal freeze" in that issue is really nicely presented. "cabal
>> >> freeze" is close to the right thing, but it's just not as fully
>> >> featured as "cabal install" (e.g. taking flags).
>> >>
>> >> As for Stackage, I think it would be helpful to cache the full build
>> >> plans computed for each package in Stackage. This is most of the work
>> >> my Nix tooling currently does, so it would be a big time saver.
>> >>
>> >>
>> >
>> > By "full build plans," do you mean the dist/setup-config file, or something
>> > else? That file would be problematic since it's Cabal-library-version
>> > specific IIRC. If you're looking for the full listing of deep dependencies
>> > and versions, we can extract that from the .yaml file using the technique I
>> > mentioned earlier.
>> >
>> > Michael
>> 
>> Yes, I meant the full listing of deep dependencies.
> 
> I've put together a Gist with an executable that does what I described:
> 
> https://gist.github.com/snoyberg/5b244331533fcb614523
> 
> You give it three arguments on the command line:
> 
> * LTS version, e.g. 1.14
> * Name of package being checked
> * true == only include dependencies of the library and executable, anything else == include test and benchmark dependencies as well
> 
> If that's useful, I can package that up and put it on Hackage.
> 
> Michael 

This is very helpfulness, thanks! There is a bootstrapping issue, though, which is, I imagine, why both Miëtek and I have been writing much more bash than we'd like. But perhaps this becomes part of a cabal-install-like bootstrap.sh script to get things going.

Anthony
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